Select an empty result set with the help of dummy table ‘dual’ from MySQL. The query is as follows −
mysql> select 1 from dual where false; Empty set (0.00 sec)
In the above query, “dual” is a dummy table and the above condition false. Therefore, it returns empty set.
Let us check with true condition. It will return the selected value. The query is as follows −
mysql> select 1 from dual where true;
The following is the output −
+---+ | 1 | +---+ | 1 | +---+ 1 row in set (0.00 sec)